If you have bought the donor semen at our clinic, you can contact us and ask for the donor number and cryobank. Thereafter you can contact the cryobank and create a depot for siblings. It is important that you tell the cryobank you already have a child with this donor. If you have bought the semen yourself at the cryobank, you contact the cryobank directly for reservation of more semen for a sibling.